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The duodecimal system, also known as base twelve or dozenal, is a positional numeral system using twelve as its base.In duodecimal, the number twelve is denoted "10", meaning 1 twelve and 0 units; in the decimal system, this number is instead written as "12" meaning 1 ten and 2 units, and the string "10" means ten.
A gross refers to a group of 144 items (a dozen dozen or a square dozen, 12 2). [1] [2] A great gross refers to a group of 1,728 items (a dozen gross or a cubic dozen, 12 3). [1] [2] A small gross [3] or a great hundred [4] refers to a group of 120 items (ten dozen, 10×12). The term can be abbreviated gr. or gro., and dates from
Also acid ionization constant or acidity constant. A quantitative measure of the strength of an acid in solution expressed as an equilibrium constant for a chemical dissociation reaction in the context of acid-base reactions. It is often given as its base-10 cologarithm, p K a. acid–base extraction A chemical reaction in which chemical species are separated from other acids and bases. acid ...
A mnemonic is a memory aid used to improve long-term memory and make the process of consolidation easier. Many chemistry aspects, rules, names of compounds, sequences of elements, their reactivity, etc., can be easily and efficiently memorized with the help of mnemonics. This article contains the list of certain mnemonics in chemistry.
Duodecimal system may refer to: duodecimal, a base-12 number system; Dewey Decimal Classification, ... additional terms may apply.
Ionic bonding is a type of chemical bonding that involves the electrostatic attraction between oppositely charged ions, or between two atoms with sharply different electronegativities, [1] and is the primary interaction occurring in ionic compounds. It is one of the main types of bonding, along with covalent bonding and metallic bonding. Ions ...
The strength of the M-O bond tends to increase with the charge and decrease as the size of the metal ion increases. In fact there is a very good linear correlation between hydration enthalpy and the ratio of charge squared to ionic radius, z 2 /r. [4] For ions in solution Shannon's "effective ionic radius" is the measure most often used. [5]
12 is a composite number, the smallest abundant number, a semiperfect number, [11] a highly composite number, [12] a refactorable number, [13] and a Pell number. [14] It is the smallest of two known sublime numbers , numbers that have a perfect number of divisors whose sum is also perfect.